Hi, welcome to the forum, you may be probably having Circadian rhythm disorders. Due to long term sleep deprivation in night time or delay in sleep will lead to excessive day time sleep or sleepiness, tiredness, loss of concentration etc.
You can get the sound proof earplugs which is very effective. These ear plugs, you can order from internet. These are usually sold by name such as 100% soundproof ear plugs.
Less than 5 hrs sleep will effect your health. Disturbance of sleep cycle disorder can be due to stress, anxiety related to your disease condition. Even such disease state can directly affect the sleep.
You need to learn simple relaxation techniques and to consider formal stress-reduction programs. Disease state will leave a burden on mental functions and it affects sleep. With appropriate use of sedatives against prescription for short term will help you. I suggest you to consult physician regarding this. Take care and regards.
Google your problem, a supplier should be easy to find?